KIMBROUGH, V. F., & VAI, M. (1991). English on call level one. McGraw-hill.
芝加哥风格引文KIMBROUGH, Victoria F., 与 Marjorie VAI. English on Call Level One. New York: McGraw-hill, 1991.
MLA引文KIMBROUGH, Victoria F., 与 Marjorie VAI. English on Call Level One. McGraw-hill, 1991.
警告：这些引文格式不一定是100％准确.